linux-kernel - Re: [PATCH 5/6] perf_counter: kerneltop: mmap

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Date:	Wed, 25 Mar 2009 13:54:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 5/6] perf_counter: kerneltop: mmap_pages argument


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Wed, 2009-03-25 at 13:35 +0100, Ingo Molnar wrote:
> 
> > > Also, when mixing streams (events,mmap) is a single: you missed 
> > > 'n' events still good?
> > 
> > How would such mixing work? Multiple counters streaming into the 
> > same mmap area?
> 
> No basically having overflow events and mmap-vma changed events in 
> a single output stream.

ah, and i missed the impact of variable size records - that too 
makes it somewhat impractical to emit overflow records in situ. (the 
kernel does not really know the precise start of the previous 
record, typically.)

	Ingo
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